能量守恒定律不仅是一条经验法则，更是思维的必然要求。

自由的功用就是解放他人。

And that's a lot of the reason why we care so much about our careers and indeed start caring so much about material goods. You know, we're often told that we live in very materialistic times, that we're all greedy people. I don't think we are particularly materialistic. I think we live in a society which has simply pegged certain emotional rewards to the acquisition of material goods. It's not the material goods we want;

成功的衡量标准不仅仅是利润，还包括积极的影响。

The challenge in computational learning theory is to understand the capabilities and limitations of learning algorithms.

正确陈述的反面是错误陈述。但一个深刻真理的反面很可能是另一个深刻真理。